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Your Oracle Database 10g is online when you execute the following statement：        SQL>ALTER TABLESPACE MY_TABLESPACE FLASHBACK OFF；   What is the result of executing this statement if the Flashback Database feature is already enabled in the database？（）
A: The database does not record flashback logs for MY_TABLESPACE
B: The tables residing in MY_TABLESPACE are not protected by the Recycle Bin.
C: All the tablespaces except MY_TABLESPACE can be recovered using Flashback Database feature.
D: None of the flashback technologies， such as Flashback Table， Flashback Transaction Query and Flashback Version Query can be used to recover individual rows within the objects from MY_TABLESPACE

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出自：Oracle认证

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